But detectives are still trying to work out what Mr Attfield did between exiting the pub, leaving behind three-quarters of a pint of beer, and his body being found.

A charity supporting people with head injuries has paid tribute to James Attfield.

Headway Essex had been supporting the 33-year-old over the past three years after he suffered a brain injury in a car crash four years ago.

Jo Wright, the charity’s chief executive, said: “Everyone at Headway Essex is shocked and saddened by the tragic death of Jim.

“He was a lovely, quiet, polite and gentle person who had made many friends through Headway.

“He will be greatly missed by our staff, volunteers and clients who have been deeply affected by this tragic incident.

“We will continue to support our clients, many of whom are vulnerable adults, through this difficult time as they mourn the loss of their friend.

“Jim had made great progress in overcoming the challenges he faced as a result of his brain injury and was determined to become independent again.

“It has been our privilege to have supported him along this journey of recovery.

“Jim was passionate about the support Headway provides and actively promoted the issues that resulted from brain injury, while also helping to raise awareness and understanding of living with the effects of brain injury.